The Irwin Tools 2634- 3 Pc. HCS - Tap 3/8" - 16 NC provides you with three taps of varying chamfer styles for various applications. These Taps are High Carbon Steel Taps for hand tapping. This kit is ideal for the end user who routinely uses the same size tap on a day to day basis for maintenance and repair. The Irwin High Carbon Steel taps are extremely durable and provide long cutting life.